Harrow-disk control



March 19, 1929. B. E. ROSE HARROW DISK CONTROL Filed April 25, 1927 INVENTOR Patented Mar. 19, 1929.

1,705,736 PATENT OFFICE.

BRUCE E. ROSE, STOCKTON, CALIFORNIA.

' minnow-DISK common.

7 Application filed April 25, 1927. Serial No. 186,244.

This invention relates to improvements in control means for disk harrows of that type in which gangs of disks are mounted on horiv zontally swinging frames.- These frames are 'normally set so that the disks are angularly disposed to the line of travel of the lmplement, and in harrowing operations it is necessary at times to turn the frames so as to place the disks in a straight fore and aft allnement.

The control devices at present used for this purpose all, as far as I am aware, necessitate backing up of the tractor or other draft means either to straighten out the disksonto return them to their angular positions; while manually operated means is'employed to 1m- 7 part the movement to the disk frames in the other direction; This is inconvenient, as it requires fre uent halting'of harrowmg operations to e ect the above described movement of the disks, and a consequent loss of time is had. v

The principal object of my inventlon 1s to eliminate this objectionable feature by providing a control means for the disk frames, so arranged that both the straightenmg out and return movement ofthe disks to their angular positions is accomplished with a continuous forward'movement of the harrow'.

A further object of the invention is to'produce a simple and inexpensive device and yet one which will be exceedingly effective for the purpose for which it is desi ed.

- These objects I accomplish y means of such structure andrelative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawingssimilar characters of'reference indicate corresponding parts 1n the several views: p v

Fig. 1 is a top, plan view'of my improved harrow and its control means.

Fig. 2 is an enlarged longitudinal v1ew of the control device showing the lever in'its. normal position. p 1

Fig. 3 is a fragmentary longitudinal view of the control structure showing the posit on of the control lever and pawls when the latter are disengaged from the, drawbar.

Fig. i is an enlarged cross section on the line 4,-4 of Fig. 2.

Referring now more particularly to the characters of reference on the drawings,:the

structure comprises a substantially pentagon posed yoke frames arranged as front and rear pairs 2 and 2 which support the gangs of vertical spindles 4 on said frames turnablef in bearing sleeves 5 on the frame 1 at the corners of the latter.

The pivot of the forward pair of frames 2 is between the twooutermost disks'and these frames normally have a rearward slope toward the center of the main frame so that the disks carried thereby are normally disposed at a forward angle to the line of travel. The PIVOtSOf the rear. pair of frames 2 are dis-. posed between the two innermost disks and said frames normally have a rearward slant toward toward their outer "ends so that the corresponding disks are also disposed-at an angle to the line of travel opposite to that of the forward gangs of disks. Owing to th1s arrangement the forwardpull on the preferably again moved to their angular positions by the following structure! I Mounted on the frame 1 at its forward end are longitudinally extending guide members 6, between which a drawbar 7 is slidable.

Longitudinal movement of the drawbar is l mited by transverse pins 8 therein which ride in longitudinal'slots 9 provided in the structure tends to cause the angular setting I guides. Links 10 extend between therear end of the drawbar and the forward frames 2.

inwardly of their pivots; while similar links 11 extend from the said frames 2 inwardly of their PIVOtS to connections with the corresponding rear frames 2 outwardly of the pivots thereof. The distance from the pivots ofthe frames 2 to the connection of the links 11 therewith is the same distance as from the pivots of the frames 2 to said links so that a movement of the frames 2througl1 a certain'arc will impart the same arcuate movement of the frames 2. Each of the links is i preferably formed of rods or the like, slidably connected together so as to form a'rigid nonyieldable element when pulled but which can give when pushed. This permits a backing up of the drawbar and harrow structure with: out tending to bend the links.

The under face of the drawbar is pro- 12 engaged by a rearwardly projecting spring pressed pawl 13 mounted in connection with the guides- (5. This pawl takes the load between the drawbar and the guides (and consequently the frame structure) when a pull is exerted on the drawbar.

Pivoted on abracket 14 projecting upwardly from andmounted on the guide members is a lever 15, the lower portion of which is formed with forked arms 15 which straddle the guides and depend therebelow. The upper portion of the lever is held at a rearward angle by a spring 16 and has a for wardly extending pull cable 17 connected thereto so that the lever may be pulled against the pressure of the spring from any suitable distance ahead of the harrow. Pivoted between the arms 15 below the drawbar is a spring pressed pawl 18 normally engaging one of the teeth 12 to'the rear of that engaged by the pawl 13. The pawl 18 has a rearward and downwardly projecting extension 19 which, after a certain rearward move- -ment of the adjacent portion of the lever has taken place, engages a transverse trip pin 20 fixed in connection with the guides.

The pin and extension are so disposed that after the pin'initially engages the extension,

a continued rearward movement of the lever causes the pawl 18 to be depressed clear of the teeth 12. At the same time the pawl 18 will also be disengaged from the drawbar teeth by means of a flexible element 21 connected to said pawl and to the lower end of the lever. By means of this construction it will be seen that with a continued pull on the drawbar, while the disk units are in'their normal angular positions, a pull on the lever a sufficient distance to disengage the pawls from said drawbar will cause the latter to longitudinal movement relative thereto, to the extent permitted by the slots 9 and pins 8. The pull on the drawbar will therefore be transmitted through to the links and consequently the disk units will be straightened out so that the disks will be in direct alinement with the path of movement of the implement, at which position the pins 8 engage the forward ends of the slots 9 as shown in Fig. 3. When it is desired to again move the disks to an angular position the lever is pulled once or reciprocated as many times as necessary, the arcuate movement of the lever be? ing just sufficient to maintain the pawls in engagement with the drawbar, without causing the trip pin to be engaged with the extension of the pawl 18. These movements of the lever will of course cause the drawbar t move rearwardly relative to the guides and main frame. Since the drawbar is anchored to.the forwardly moving draft means, the action actually obtained is a forward movebe released from the guides and frames for ment of the frame 1. This of course causes vided with forwardly facing ratchet teeth the various pivots 4: to be moved forwardly also, the disk supporting frames then'swinging on the connection of the linkstherewith as pivots. This' restores the angular setting to the disk units, such setting'of course depending on how many reciprocations has I been given the lever, and at which point in the length of the drawbar the fixed pawl 13 then engagesthe same.

The position of the pivots on the disksup porting frames and the arrangement of the pivots of the front frames relative to those on the rear frames is such that the ground pressure thereagainst acts on allframes to the same extent and in the same direction such as will. tend to restore and maintain the frames in an angular setting. This obviously reduces to a minimum the physical effort necessary to operate the lever in a disk resetting position. t

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

, While'this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit-of the -in' vention, as 'defined by the appended claims.

Having thus described'my invention what I claim as new and useful and desire to secure by Letters Patent'is:

1. A harrow including a main frame, a disk-supporting frame pivoted thereon for horizontal swinging movement, a drawbar mounted on the'main frame for longitudinal sliding movement relative thereto, a connec tion between the drawbar and the disk-supporting frame, means for normally holding the drawbar againstforward movement relative-to the main frame, a lever mounted in connection with said main frame, means between the lever and drawbar for moving the mounted on: the main frame for longitudinal sliding movement relative thereto, a 'connection bet-ween the drawbar and the disk-supporting frame, means for normallyholding the drawbar against forward movement relative to the main frame, a lever mounted in connection with said main frame, means controlled by the movement of the lever acertain distance in one direction for moving the main means controlled by a movement of the lever frame forwardly relative to the drawbar, and

a further distance in the same direction for releasing the holding means.

3. A harrow including a main frame, a disk-supporting frame pivoted thereon for horizontal swinging movement, a drawbar mounted on the main frame for longitudinal sliding movement relative thereto, a connection between the drawbar and the disk-supporting frame, one face of the drawbar having forwardly facing ratchet teeth thereon, a pawl normally engaging one of said teeth, a lever pivoted in connection with the main frame, a pawl on said lever to engage said ratchet teeth whereby when the lower end ofthe lever is moved rearwardly a certain distance the frame will be moved forwardly relative to the drawbar, means between the lever and said first named pawl for pulling the same clear of the drawbar teeth when said lever is moved a further distance rearwardly, and means controlled b such further movement of the lever for a so moving the leverpawl clear of the drawbar-teeth.

4. A harrow including a main frame, a disk-supporting frame pivoted thereon for horizontal swinging movement, a drawbar mounted on the main frame for longitudinal sliding movement relative thereto, a connection between the drawbar and the disk-supporting frame, one face of the drawbar having forwardly facing ratchet teeth thereon, a pawl normally engaging one of said teeth, a lever pivoted in connection with the main frame, a pawl on said lever to engage said ratchet teeth whereby when the lower endof the lever is moved rearwardly a certain distance the frame will be moved forwardly relative to the drawbar, a normally slack flexible connection between said first named pawl and the lower end of the lever arranged to cause said pawl to be moved clear of the drawbarteeth when the lever is moved a further distancerearwardly, and means controlled by such further movement of the lever for also moving the lever-pawl clear of the drawbarteeth.

5. A harrow including a main frame, a disk-supporting frame pivoted thereon for horizontal swinging movement, a drawbar mounted on the main frame for longitudinal sliding movement relative thereto, a connection between the drawbar and the disk-supporting frame, one face of the drawbar hav ing forwa'rdl facing ratchet teeth thereon, a pawl normali y engaging one of said teeth, a lever pivoted in connection with the main frame, a pawl on said lever to engage said ratchet teeth whereby when the lower end of the lever is moved rearwardly a certain distance the frame will be moved forwardly relative to the drawbar, means between the lever and said first named pawl for pulling the same clear of the drawbar-teeth when said lever is moved a further distance rearwardly, a fixed trip member mounted rearwardly of the normal travel of the lever-pawl, and a rearward extension on said lever pawl to engage and ride against said member with such further movement of the lever; the extension being arranged to then cause the lever pawl to be pulled clear of the drawbar-teeth.

6. A harrow including a main frame, a disk-supporting frame pivoted thereon for horizontal swinging movement, a drawbar mounted on the main frame for longitudinal sliding movement thereto, a connection between the drawbar and the disk supporting frame, forwardly facin ratchet teeth out on the under side of the rawbar, a lever pivoted intermediate its ends on the main frame and depending below the drawbar, "and a rearwardly facing pawl on the lower end of the lever normally engaging the teeth whereby a forward pull on the up er end of the lever will cause the frame to moved forwardly relative to the drawbar.

In testimony whereof Iafiix m BRUCE ROSE.

signature. 

